rgw: Initialization of members rgw_sync, rgw_rados

rgw: Initialization of members rgw_sync, rgw_rados

Fixes the coverity issues:

** 1355581 Uninitialized scalar field
CID 1355581 (#1 of 1): Uninitialized scalar field (UNINIT_CTOR)
2. uninit_member: Non-static class member cur_shard is not initialized in
this constructor nor in any functions that it calls.

** 1356907 Uninitialized scalar field
2. uninit_member: Non-static class member field mtime.tv_sec is not initialized
in this constructor nor in any functions that it calls.
CID 1356907 (#1 of 1): Uninitialized scalar field (UNINIT_CTOR)
4. uninit_member: Non-static class member field mtime.tv_nsec is not initialized
in this constructor nor in any functions that it calls

Signed-off-by: Amit Kumar amitkuma@redhat.com